| K and B Restaurant Ltd | Hospitality | 2023 |
| K and D Industrial Cleaning Ltd | Administrative & support | 2021 |
| K and H Mortgages Ltd | Financial services | 2024 |
| K and S Property and Developments (Yorkshire) Ltd | Construction | 2026 |
| K B Plumbing Limited | Construction | 2016 |
| K Binks Holdings Limited | Financial services | 2023 |
| K CH Barbers Ltd | Other services | 2024 |
| K D 1 Burger Limited | Hospitality | 2021 |
| K D Holdings Ltd | Financial services | 2015 |
| K K Akli Risto Limited | Hospitality | 2025 |
| K K M East Yorkshire Ltd | Wholesale & retail | 2024 |
| K Lavery Associates Limited | Professional & scientific | 2012 |
| K M Property Services Limited | Real estate | 2009 |
| K M Savage Properties Limited | Real estate | 2020 |
| K W Cuts Ltd | Other services | 2024 |
| K&A Inns Ltd | Hospitality | 2015 |
| K&E Cosy Properties Ltd | Real estate | 2026 |
| K&G (Yorkshire) Ltd. | Construction | 2009 |
| K&M Communications Limited | Information & communication | 2025 |
| K&N Properties Hull Ltd | Real estate | 2024 |
| K'S Diner Limited | Hospitality | 2017 |
| K-Nect Property Ltd | Administrative & support | 2024 |
| K. and L. Damp Proofing Limited | Construction | 2003 |
| K. Binks (Heating) Limited | Construction | 1963 |
| K. M. Pressings Limited | Manufacturing | 1998 |
| K.A Green Limited | Hospitality | 2021 |
| K.A. Rasmussen Ltd. | Financial services | 2017 |
| K.A.S. Services Limited | Construction | 2005 |
| K.C. Kingston Contractors Limited | Professional & scientific | 1976 |
| K.F. Kapica Construction Ltd | Construction | 2016 |
| K.P. Servicing Limited | Manufacturing | 2022 |
| K2 Bond Street Limited | Construction | 2017 |
| K3 Building Services Ltd | Construction | 2024 |
| K8 Affiliate Limited | Professional & scientific | 2024 |
| K9 Asset Protection Ltd | Administrative & support | 2017 |
| KA Properties 4 Limited | Real estate | 2025 |
| KA Properties Derby Limited | Real estate | 2025 |
| KA Properties Hull Limited | Real estate | 2025 |
| KA Properties Worcester Limited | Real estate | 2025 |
| KA Property Hull Limited | Real estate | 2024 |
| Kaas Services Ltd | Wholesale & retail | 2025 |
| Kabe Holdings Limited | Financial services | 2020 |
| KAC Transport Limited | Transport & logistics | 2015 |
| Kacper Magic Builder Ltd. | Construction | 2014 |
| Kadima Consulting Ltd | Information & communication | 2025 |
| KADY68 Ltd | Health & social care | 2025 |
| Kafe Persi Limited | Hospitality | 2025 |
| KAH Electrical Installations Ltd | Construction | 2025 |
| Kaitlan's Kitchen Limited | Hospitality | 2023 |
| Kaizen Business Group Limited | Professional & scientific | 2021 |
| Kaizen Business Services Limited | Professional & scientific | 2010 |
| Kalamon Fund Limited Partnership | | 2008 |
| Kaldiz Ltd | Wholesale & retail | 2025 |
| Kaliwal Knockon Limited | Wholesale & retail | 2026 |
| KAMAL22 Ltd | Wholesale & retail | 2025 |
| Kamaly Kitchen Limited | Hospitality | 2025 |
| Kamicraft Studio Ltd | Professional & scientific | 2023 |
| Kamin Group Limited | Manufacturing | 2024 |
| Kandle Care Ltd | Health & social care | 2022 |
| Kandu Education Limited | Education | 2009 |
| Kaninify Limited | Information & communication | 2026 |
| Kaplan Fast Food Cash & Carry Hull Ltd | Wholesale & retail | 2024 |
| Kapvan Ltd | Transport & logistics | 2020 |
| KAR Superlift Ltd | Professional & scientific | 2015 |
| Kara Sanderson Aesthetics Limited | Other services | 2026 |
| Karan 05 Limited | Wholesale & retail | 2023 |
| Karasud Ltd | Transport & logistics | 2018 |
| Kardan Ltd | Construction | 2025 |
| Karen Bright International Limited | Professional & scientific | 2003 |
| Karen Moss Health Ltd | Health & social care | 2026 |
| Karens Kars Limited | Transport & logistics | 2013 |
| Karina Engineering Limited | Professional & scientific | 2018 |
| Karina Jacenko Photography Ltd | Professional & scientific | 2025 |
| Karlshamns International PLC | Manufacturing | 1989 |
| Karlshamns UK Holdings PLC | Manufacturing | 1905 |
| KAS Wind Ltd | Construction | 2023 |
| Kasm Properties Limited | Real estate | 2021 |
| Kass Roofing Ltd | Construction | 2020 |
| Katarzyna Lozynska Ltd | Education | 2023 |
| Katcrewing Ltd | Other services | 2025 |
| Katherine Dawson Limited | Health & social care | 2013 |
| Katie Turner Consultancy Ltd | Professional & scientific | 2025 |
| Katy Aesthetics Limited | Other services | 2023 |
| Kaufland Ltd | Wholesale & retail | 2026 |
| Kaur Nest Properties Ltd | Real estate | 2025 |
| Kawunga Limited | Agriculture & fishing | 2025 |
| Kayan Holdings Limited | Financial services | 2025 |
| Kayco (Holdings) Limited | Professional & scientific | 2013 |
| Kayco (Properties) Limited | Real estate | 2002 |
| Kaylee Carver Ltd | Arts & recreation | 2021 |
| Kaymaz Ltd | Hospitality | 2011 |
| Kazmi Immigration Advisory Ltd | Professional & scientific | 2026 |
| KB Flooring Hull Limited | Wholesale & retail | 2024 |
| KB Investment Property Ltd | Real estate | 2025 |
| KB Properties (Hull) Limited | Extraterritorial | 2012 |
| KC & Co Consultancy Ltd | Information & communication | 2014 |
| KC Process Systems Ltd | Manufacturing | 2010 |
| Kc-Rope-Access-Solutions Ltd | Administrative & support | 2025 |
| Kcg-Kellner Consulting Group Ltd | Professional & scientific | 2025 |
| KCL Capbuild Ltd | Construction | 2020 |